Blackberry 6750 Getting Started Manual page 46

Getting started
If you are in an area of wireless coverage that is sufficient for
receiving email messages, the registration message should arrive
within a few seconds.
Note: Your handheld must be activated on your service provider's
network before you can register and before you can send messages or
place phone calls. If your handheld is not activated on your service
provider's network, or if your handheld cannot find a CDMA network
that is allowed by your service provider, your handheld attempts to find
any available CDMA network if you need to place an emergency phone
call.
You can set your handheld to select a network automatically, or you can
restrict the handheld from roaming and acquiring any network system.
Refer to "Customizing your handheld options" in the Handheld User
Guide for more information.
After you load new applications with the desktop software's Application
Loader tool you might need to register your handheld . Refer to the
Application Loader Online Help for more information on loading
applications.
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Network screen menu - Register Now item
BlackBerry Wireless Handheld